A portrait of power, warts and all A series of novels set in Cromwell's England shows that taking control is easy enough — but keeping it is much harder

Seeker’s answers are instructive: because he fought for them once, and against another lot who were worse. But that is not enough to sustain — or deserve — lasting loyalty.

It is the theme of loyalty that makes the Seeker novels good reading for politicians, who always need to understand why people support causes — and why they stop.

In the end of the series — so far, at least, for there is hope she will write more — Maclean shows Seeker’s break with the collapsing Cromwell regime not as a grand gesture or an exercise in psychodrama but rather the way real people make big decisions — with a resigned shrug.

Cromwell’s story deserves more attention in the Britain that voted for Brexit. It’s a reminder that, no matter what we tell ourselves about our phlegmatic stability, Britain does indeed do revolutions. Cromwell, of course, was no radical from outside the system. A son of the gentry who sat in Parliament, he led a cause that united disgruntled notables and true grassroots revolutionaries — for instance, the Levellers, who were to be marginalised and bitterly disappointed by Cromwell in power.

Maclean’s hero is part of that non-conformist tradition, a Seeker by faith as well as name, he was part of a small, obscure sect before shifting his faith to Cromwell’s cause and its defence against scheming royalists plotting to restore the dissolute Stuart monarchy.

Such royalists are still a major presence in the England Maclean guides her readers through. Because no revolutionary regime can make its opponents simply disappear — accommodations must be made. The Metaphysical poet Andrew Marvell makes regular appearances as an agent of Seeker’s intelligence operation. Marvell’s precise loyalties were and are unclear: he lionised leading Royalists, but then worked for Thomas Fairfax, the great parliamentary general.

We also meet a young Samuel Pepys, another parliamentarian who converted to Royalism when Cromwell died in 1658.

When that death comes, Seeker is in Bruges tracking the royalist cells that made that city their base while supporting the young Charles Stuart in his designs on the throne amid the shifting backdrop of European politics. This is the setting for the fifth and most recent Seeker novel, The House of Lamentations. It’s a nice way to illustrate the international dimensions of turmoil in British government, as well as a reminder that British leadership worrying about European plots is not a new thing.

The Seeker novels’ lessons for today’s rulers are numerous.  Perhaps the biggest is that taking power is easy enough — just win some big battles — but keeping it is much harder. In the end, the stars of the series are the ordinary folk who lent their support to Cromwell and his cause, but then, tired and resigned, welcome back the Stuart monarchy, albeit briefly. It’s a reminder that while elites take politics and government very seriously, the public on whom those things ultimately depend generally don’t pay too much attention, instead just getting on with their lives. Revolutions are easy to declare but hard to sustain.